Guard for draw-bridges



(No Model.) 2 sheets-sheet 1. A. BOSCH. GUARD DOR DRAW BRIDGES.515325905. Patented SepR, 1885.

wwwhww- 2 SheetssheetJ 2.

(No Model.) i

- RROSGR.v GUARD POR DRAW BRIDGES.v

No. 325,905. PatentedSept. 8, 1885.

I UNITED 4ASTA-rias PATENT OFFICE.

ANDREAS BOSCH, on PRAIRIEVDUCHIEN, WISCONSIN.

GUARDFOR DRAW-BRIDGES.V

SPECIFICATION forming part of Letters Patent Nasal-5,905, datedseptember a, 1885.

Application mea April l5, 18.95. (No intrisa To aZZ whom it may concern:

Be it kncwnthat I, ANDREAS BOSCH, a citizen of the United4 States,residing at Prairie du Chien, in the county of Crawford and State" fenceapplied, the guardsections being in an elevated position in full lines,and in a depressed position in dotted lines. Fig. 2 isa perspective viewof one corner of the draw. Fig. 3 is a vertical section through theabutment, indicating one of the loaded guard-sections and its bearingsand jointed connections with the frameworkfof the abutment. Figs. 4, 5,6, 7, 8, and 9 are views in detail of certain parts which are necessaryto be used in vconnection with the draw, theabutment, and the loadedguard-sections for the purpose of actuating the latter. v Y Y i Myinvention relates to draw-bridges wherein the draw swings about avertical fulcrum or king-bolt, and it has especial relation toimprovements on my draw-bridge for which Letters Patent were granted tome, bearing `date on the 11th day of March, 1884, and numbered 295,104.

The following description of myinvention, when taken in vconnectionwith`the` annexed drawings, will enable those skilled in the art tofully understand it.

In said Letters Patent I have described guards having iiangedshanks orcams which were movable about fulcra, for the purpose of causing them tobe moved by the closing and opening of a horizontally-swinging .draw.into position for guarding (or fencing) the roadway or leaving the sameclear, depending upon the position of the said draw-bridge.

My guard-fence consists of independent sec` tions A,'as illustrated inthe annexed drawings,

each individual section lconsisting of a broad fence-guard, a, `a narrowshank, a', a ca1ny iiange, a2, and a loaded portion, a3, as shown.

Each one of these fence or guard sections is pivoted to a timber, A, ofthe abutment A2 vby means f a king-bolt, b@ The end of this .'kingbolt,to which each section A is attached,

consists of a ball, b iitted into a socket in the section, and operatingpractically like the wellknown ball-and-socket joint. The said kingboltb`is inserted from the back part of each section A, and a plate, c, isfastened on the back part of this section for thepurpose of `completingthe joint, One portion of this secwings, or anges,

tion is provided with cams, above referred to, fora purpose hereinafterexplained. Y

Then the several sections constituting the fence or bridge-guard areupright, as shown in.

Fig. 1 in full lines, each section Ais heldin its place by means of adouble key in combination 'with certain springs,hereinafter againreferred to. This double key consists of an upper key,l e, and a lowerkey, f. The keye has a bifurcated uppergend, in which the section Arests. The lower key, j', is simply a bolt working through timber A andentering a depression in the section A. The key e is fastened to thetimber to which the section A is attached by means of a deviceconsisting of two pairs lof arms, g, the upper pair of arms beingsecured to the upper key, and the lower pair of` arms to plate h, towhich latter the two lower keys are fastened. j The object of these twopairs of arms g g and the plate connecting the two keys is this when thetop of the upper key is forced back from the section A, the top of theplate h is forced forward, and the lower part of this plate is forcedbackward, thus drawing the two lower keys 4 (which are fastened to thesame) from the section Aandreleasingthe same. Fastened tothe second andlower timber, B, is a grooved roller,'f, and on each side of this rolleris laV movable block, shaped as shown in the drawings and lettered j.These blocks have grooves at their` ends, and they are connectedtogether by a chain, j', passing over an annular depression in the saidroller. Behind each block is a spiral spring, 7c, upon which the blocksrest, this spring being fastened to the timber B. On top `of the lspringk is a small roller, k', so that the block can move on the springwithout displacing the same;y This arrangement is just behind thelowerend of the section A when the latter is shown'in Fig. l in full lines.

IOO

Secured to the third timber, C, near the top of the bridge, between thesections" A, are ro`lers Z. (Shown clearly in Figs. 1 and.)`

To the end of the draw-bridge D is secured a plate, d, to which areattached driving-bolts d and d3 and an opening-key, d2. The plate d,with key d2, is preferably so arranged that it can be adj usted by meansof screws for the purpose of compensating for expansion and contractionof the bridge. The object of the driving-bolt d is to strike the cams ofthe several fence-sections A and to raise and lower the same. The objectof the opening-key is to strike the upper key, (marked 6,) which holdsthe section A in place when upright, as shown in Figs. 1 and 3, andforce said key back, by which operation the two lower keys are drawnfrom the holes in said section, and the latter is released and free tomove.

The operation is as follows: Vhen the drawbridge is opened, the sectionsA are upright,

as shown in Figs. 1 and 3, and are held firmly in this position by thedouble key above described-,in combination with the spiral springs, therol-1ers and blocks pressing upon the lower parts of the sections A. Inclosing the draw D the opening-key d2, attached to plate dV on thisdraw, first strikes the upper key, @,which holds the section A in place,and moves this key back, by which operation the two lower keys are drawnback and the sections are free to move. Near the upper end of key e,

just beneath the notch in the top of the same,

in the center of the key, and projecting from the side near the sectionA,is a friction-roller, e2, (see Figs. 3 and 8,) which strikes againstthe face oi' plate d, thus preventing` any abrasion of the key upon saidplate or the timbers ofthe bridge, &c. ,as the draw is-operated. Thedriving-bolt d', whichiis attached to the-plate on the draw of thebridge,striking the'sectionv A, forces it over. The top part of thesection strikes the rollers Z, whichare mounted in the upper timber onthe abutment, and these rollers force the upper part of the section outso that it does not strike the next section, which is still upright',the ball-andsocket joint of the section with the kingfbolt allowing thesection to move freely in all directions, so that the roller Z easilymoves thetop of the section over so as to pass the next sectionwithoutinterference. As the draw continues closing, a second driving-bolt, d3,strikes the'cam of a section A at A4, and forces said section stillfurther over to an inverted perpendicular position, where it hangssuspended out of the way, as shown in dotted lines in Fig. 1, and thedraw, moving on, performs the same operation with each sectionsuccessively until the draw is closed and the roadway left clear. Thecam a2 is so shaped that the two drivingbolts have the effect to easilypass the section over, as described.

In opening the draw the driving-bolt d strikes a cam c2 at at, andraisesa section to a horizontal position. Then the second drivingbolt,d, strikes another part of the cam ai at c5 and continues to raise thesection. As the section is thus raised, the lower part, a3, passes uponone of the blocks behind which is the spiral spring attached to thelower timber on the bridge-abutment,and passes over the roller betweensaid blocks, the latter and the spring press the bottom of the sectionoutward, and the section is raised into an upright position. (Shown inFigs. 1 and 3.) As the section arrives at its upright position the twolower keys, which have been held back by the section, now enter theholes in the section, and by the weight of the double key and platejoining the same the two lower keys are adjusted as above stated, andthe upper key falls forward to its place, the section resting in itsgroove, and the double keyslwith the spiral springs and blocks hold thesection firmly in place, as shown in Figs. 1 and 3.

My invention may bev applied to all bridges, whether with abutments orspiles, and its superiority especially consists in the.Y fact that thefence guards or sections A are operated by the mere opening and closingof the draw and without eXtra machinery outside of the bridge itself.

If desired, at night lights can be attached to the several sections orin'any convenient manner to the movable parts', so as to signal by theirposition whether the draw is open or shut.

In practice I prefer to suitably pivot the outer ends of the blocks j j,and to provide their free ends with anti-friction rollers, against whichthe ends of the guards A abut. The guards are thus freely movable.

Having described my invention, whatl claim as new, and' desire to secureby Letters Patent, 1s

1. In a draw-bridge, a fen'ce consisting. of a series of guard-sections,A, loaded at a3, and

provided with cams or wings at, in combina- A tion with ball-and-socketjoints and devices describedl for actuating and holding said sections,substantially as described.

2. rI`he combination of loaded guard sections, connected to asupporting-timber by bal1-and-socketjoints,with the blocks,springs, andintermediate rollers, as described, for the purpose of arresting thesaid sections and aiding in holding them upright, as specied.

3. The combination. of the upper and the lower rollers with the sectionhaving intermediate ball-and-socket connection and devices applied tothe draw for actuating said sections, substantially as described.

4. The combination, with the guard -sections and their ball-and-socketconnections,of the blocks and their intermediate rollers and chain,substantially as described'.

5. The combination,with the pivoted guardsections,as described, of thepivoted bi'furcated keys e, and latches f, and releasing devicestherefor applied to the end of the draw, substantially as described.

6. The combination of the keys having roil- In testmonywhereof I ax my.signature ers e2and1atches,their oonneotions,aud guardin presence oftwo Witnesses. sections A, substantially as described.

7. The Combination, with the loaded guard- ANDREAS BOSCH. 5sections,latchng'devicesandopeningdevioes, Witnesses:

as described, of the spring-aotuated bearings A. J. MESIIJQN, K,substantially as and for the purposes de- O. B. THOMAS.

scribed.

